JPS5749907A - Noise eliminating circuit and in-focus detecting circuit - Google Patents

Noise eliminating circuit and in-focus detecting circuit

Info

Publication number
JPS5749907A
JPS5749907A JP55125170A JP12517080A JPS5749907A JP S5749907 A JPS5749907 A JP S5749907A JP 55125170 A JP55125170 A JP 55125170A JP 12517080 A JP12517080 A JP 12517080A JP S5749907 A JPS5749907 A JP S5749907A
Authority
JP
Japan
Prior art keywords
full
circuit
register
signal
adder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP55125170A
Other languages
Japanese (ja)
Inventor
Akira Takahashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP55125170A priority Critical patent/JPS5749907A/en
Priority to US06/299,291 priority patent/US4479706A/en
Priority to DE3135710A priority patent/DE3135710A1/en
Publication of JPS5749907A publication Critical patent/JPS5749907A/en
Priority to US06/599,772 priority patent/US4533227A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06—Systems determining position data of a target
    • G01S17/08—Systems determining position data of a target for measuring distance only
    • G01S17/10—Systems determining position data of a target for measuring distance only using transmission of interrupted, pulse-modulated waves
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28—Systems for automatic generation of focusing signals
    • G02B7/30—Systems for automatic generation of focusing signals using parallactic triangle with a base line
    • G02B7/32—Systems for automatic generation of focusing signals using parallactic triangle with a base line using active means, e.g. light emitter

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)
  • Optical Radar Systems And Details Thereof (AREA)

Abstract

PURPOSE:To eliminate a large-level noise and to take a distance measurement with high precision, by determining the level of a digital signal by a noise eliminating circuit on the basis of frequencies of appearance of a high and a low level in a preset section. CONSTITUTION:An analog input is compared with a reference voltage ref by a comparator COM1 and converted into a digital signal having binary levels H and L. This signal is shifted by a shift register SR in response to the rise of a pulse phi2. A full-adder FA1 adds the 1st and 2nd bit outputs of the register SR, and a full- adder FA2 adds the 3rd bit output of the register SR, the sum output of the full- adder FA1, and a carry signal. The carry signals of the full-adders FA1 and FA2 are outputted through an OR circuit OR1, but its output signal is an H when >=2 bit outputs of the register SR are Hs. Therefore, when the digital signal has one H level out of three successive levels, it is removed as a noise. Thus, noises are eleminated and a measurement of distance is taken with high precision.
JP55125170A 1980-09-09 1980-09-09 Noise eliminating circuit and in-focus detecting circuit Pending JPS5749907A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP55125170A JPS5749907A (en) 1980-09-09 1980-09-09 Noise eliminating circuit and in-focus detecting circuit
US06/299,291 US4479706A (en) 1980-09-09 1981-09-03 Distance measuring circuit
DE3135710A DE3135710A1 (en) 1980-09-09 1981-09-09 DISTANCER SWITCHING ARRANGEMENT
US06/599,772 US4533227A (en) 1980-09-09 1984-04-13 Distance measuring circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55125170A JPS5749907A (en) 1980-09-09 1980-09-09 Noise eliminating circuit and in-focus detecting circuit

Publications (1)

Publication Number Publication Date
JPS5749907A true JPS5749907A (en) 1982-03-24

Family

ID=14903612

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55125170A Pending JPS5749907A (en) 1980-09-09 1980-09-09 Noise eliminating circuit and in-focus detecting circuit

Country Status (1)

Country Link
JP (1) JPS5749907A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52126225A (en) * 1976-04-15 1977-10-22 Asahi Optical Co Ltd Automatic focusing unit control circuit for ignoring pseudoofocus position detection signal
JPS54158226A (en) * 1978-04-25 1979-12-13 Polaroid Corp Method of automatically positioning lens and camera executing same
JPS5527987A (en) * 1978-08-21 1980-02-28 Minolta Camera Co Ltd Distance measuring instrument

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52126225A (en) * 1976-04-15 1977-10-22 Asahi Optical Co Ltd Automatic focusing unit control circuit for ignoring pseudoofocus position detection signal
JPS54158226A (en) * 1978-04-25 1979-12-13 Polaroid Corp Method of automatically positioning lens and camera executing same
JPS5527987A (en) * 1978-08-21 1980-02-28 Minolta Camera Co Ltd Distance measuring instrument

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